I'm really stumped here with trying to figure out the rate() function for Prometheus. Looking at the documentation for rate(), I'm failing to understand their example:
rate(http_requests_total{job="api-server"}[5m])
And the description:
The following example expression returns the per-second rate of HTTP requests as measured over the last 5 minutes, per time series in the range vector
That 5 minutes is stumping me. You're getting the per-second rate of requests (even though a scrape would be, for instance, every 15s) but where does the "over the last 5 minutes" come into play? I'm looking at a graph that spans 30 minutes, and "over the last 5 minutes" means what with that query/equation?
Thanks in advance. Hoping somebody can explain this in different terms!
